package com.gxa.medical.controller;

import com.gxa.medical.util.JsonResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.util.Map;
import java.util.UUID;

@RestController
public class UploadController {
    @RequestMapping("/upload")
    public Map<String,Object> upload(@RequestParam("file") MultipartFile multipartFile,
                      HttpServletRequest request) throws Exception {
        //QQ截图20200724153059.png
        String originalFilename = multipartFile.getOriginalFilename();
        System.out.println("originalFilename:" + originalFilename);
        // 从原始文件名中获取后缀,作为新添加的文件的文件名后缀(匹配)
        String subfix = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
        System.out.println("subfix:" + subfix);
        //使用UUID作为文件名,保证服务器中存放的文件名唯一
        String targetFile = UUID.randomUUID().toString().replace("-", "") + "." + subfix;
        System.out.println("targetFile:" + targetFile);
        // 通过request获取当前程序的根路径"/"
        String path =request.getSession().getServletContext().getRealPath("/");
        String fileName = path + "/images/uploadImg/" + targetFile;
        System.out.println("fileName:" + fileName);
        // 构建文件对象
        File uploadFile = new File(fileName);
        //核心操作(含有异常操作, 利用异常设定状态码(和前端约定)
        // 此处应当和ExceptionController结合, 当try执行成功则设定状态码0
        // 出现异常则设定其他
        // 再将异常信息结合BusinessException抛出, 交给ExceptionController处理
        multipartFile.transferTo(uploadFile);
        JsonResult jsonResult = new JsonResult();
        // 返回状态:200 表示上传成功
        jsonResult.setCode("200");
        // 返回服务器保存后的文件名
        jsonResult.set("fileName", targetFile);
        return jsonResult.getResultMap();
    }
}

